往复挤压对ZK30镁合金组织和力学性能的影响
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摘要
为了改善ZK30镁合金的凝固组织,提高其力学性能。采用光学显微镜(OM),维氏硬度和拉伸-压缩试验机等手段,评价不同往复挤压道次对ZK30镁合金表面微观形貌和力学性能的影响。实验结果表明往复挤压道次能够显著影响ZK30镁合金的表面微观形貌和力学性能。当往复挤压道次增加时,合金的晶粒会慢慢细化。当ZK30镁合金往复变形道次大于8次时ZK30镁合金的力学性能变化不大。故为了提高ZK30镁合金的力学性能,采用往复变形道次大于8次的往复挤压工艺。
To improve solidification microstructure and the mechanical properties of ZK30 magnesium alloy,we investigated the effects of cyclic extrusion and compression( CEC) pass on the microstructure and the mechanical properties of ZK30 magnesium alloy by optical microscope( OM),Vickers hardness and tensile-compressive testing machine. The results showed that the CEC pass number could effect on the mechanical properties and solidification structure of ZK30 alloy. It was found that the grain refinement intensified with increasing cyclic extrusion and compression( CEC) pass number obviously. The mechanical properties of ZK30 alloy were improved with increasing CEC pass number,till CEC pass number was at 8-passes. In order to improve the mechanical properties of ZK30 alloy,the CEC pass number should be more than 8-passes.
To improve solidification microstructure and the mechanical properties of ZK30 magnesium alloy,we investigated the effects of cyclic extrusion and compression( CEC) pass on the microstructure and the mechanical properties of ZK30 magnesium alloy by optical microscope( OM),Vickers hardness and tensile-compressive testing machine. The results showed that the CEC pass number could effect on the mechanical properties and solidification structure of ZK30 alloy. It was found that the grain refinement intensified with increasing cyclic extrusion and compression( CEC) pass number obviously. The mechanical properties of ZK30 alloy were improved with increasing CEC pass number,till CEC pass number was at 8-passes. In order to improve the mechanical properties of ZK30 alloy,the CEC pass number should be more than 8-passes.
引文
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[2]徐春杰,郭学锋,郑水云,等.往复挤压高韧MgZn-Y合金[J].材料工程,2007(07):16-20.
[3]宋佩维.往复挤压Mg-4Al-2Si-0. 75Sb镁合金的显微组织与力学性能[J].金属热处理,2011,36(3):1-8.
[4]张建新,高爱华,郭学锋,等.往复挤压工艺对Mg-5Sn-1. 5Al-1Zn-1Si合金组织演变的影响[J].中国有色金属学报,2014,24(12):2978-2984.
[5]LI N. Magnesium Advances and Application in North America Automotive Industry[J]. Material Science Forum,2005,488-489:931-935.
[6]陈勇军.往复挤压镁合金的组织结构与力学性能研究[D].上海:上海交通大学,2007.
[7]林金宝.往复挤压ZK60与GW102K镁合金的组织演变及强韧化机制研究[D].上海:上海交通大学,2008.
[8]彭勇,王顺成,郑开宏,等.高性能镁合金铸造技术研究进展[J].铸造技术,2013(2):203-207.